Podostemacece. 177 



1. TRISTICHA, Thouar. 



Tristicha, Thouar s Gen. Madag. n. 8 ,• Presl in Rel. 

 Hcenlc. p. 86 ; Endl. Gen. Plant, n. 1836 ; Meisner Vas. Gen. 

 p. \%2 (88). — Dufourea, Bory in Wild. sp. PL 5. p. 55 ,• 

 St. Hilaire in Mem. Mus. 10. p. 471 ; Spreng. Syst. Veg. 1. 

 p. 6; Rcem. et Sch. Syst. Veg. Mantissa in Vol. 1, p. 79. 

 -— Philocrena, Bonp. Mem. Ac. Pet. 6 Ser. 3. p. 80. t. 6. 



Char. — Spatha membranacea, diphylla vel caruoso-conica 

 ad apicem aperta, Flos pedicellatus. Perigonii foliola 3, 

 membranacea, concava, subimbricata, persistens. Stamina 

 1-3, hypogyna, foliolis perigonii alterna : filamenta libera, 

 filiformia, indivisa : anthera? terminales, ellipticae vel ob- 

 longo-lineares, biloculares. Ovarium 3-loculare. Stigmata 

 3, subulata, indivisa. Capsula costata, 3-locularis, 3 valvis, 

 valvis a placenta centrali trigona, membranaceo-alata, solutis. 

 Semina plurima, minima, imbricata, oblonga, obtusa : testa 

 membranacea, brunea. — Herbulae annuce, habitu muscorum 

 vel hepaticarum quorundum, inter tropicos toties mundi in 

 rivulis submerscc. Caule dichotomo-ramoso vel depresse sub- 

 orbiculari. Foliis plurifarium imbricatis vel fasciculatis, 

 semiorbicularibus vel linearibus, integerrimis vel minute 

 enticulatis. Floribus solitariis. 



1. TRISTICHA CEYLANICA. Gardn. 



T. frondibus suborbicularibus horizontalibus irregulariter 

 lobatis, foliis fasciculatis parvis linearibus obtusis, floribus e 

 parte superiore frondium exsertis, spatha carnosa conica 

 echinata apice aperta, capsula 9-costata. 



Hab. — On smooth Gneiss rocks in rapids in the bed of the 

 Mahawelle Ganga, below Peradenia, Ceylon. Fl. March. 



Descr. — Fronds suborbicular, horizontal, growing in large patches 

 on the flat surface of rocks, irregularly and obtusely lobed, crustaceous, 

 of a yellowish brown colour above, pale green beneath. Leaves in 



